Wrap for a post or beam



FIG. 1 is a perspective view of a sheath for a pencil rail showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

I disclaim the dashed lines as forming no part of the claimed design. 

CLAIM I claim the ornamental design for a sheath for a pencil rail, substantially as shown and described. 